PVC contains Bisphenol A (BPA) as a polymerization inhibitor. That's basically why PVC is not exactly a desired material to use, if you plan on i.e. breeding snakes.
BPA is an endocrine disruptor and an active synthetic estrogen that decreases testosterone in male snakes. Further, the offspring of parents exposed to BPA can (not all research projects had the same results, so let's stick to the word "can) cause neurological and behavioral disorders and decreases fertility.
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